Measurements of single diffraction at root s=630GeV; Evidence for a non-linear alpha(t) of the pomeron

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Brandt A., Erhan S., Kuzucu A., Lynn D., Medinnis M., Ozdes N., ...Daha Fazla

NUCLEAR PHYSICS B, cilt.514, ss.3-44, 1998 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 514
  • Basım Tarihi: 1998
  • Doi Numarası: 10.1016/s0550-3213(97)00813-4
  • Dergi Adı: NUCLEAR PHYSICS B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.3-44
  • Anahtar Kelimeler: single diffraction, pomeron, pomeron trajectory, flux factor, DEEP-INELASTIC SCATTERING, LARGE RAPIDITY GAP, CERN SPS COLLIDER, TOTAL CROSS-SECTIONS, ELASTIC-SCATTERING, PROTON DIFFRACTION, QUARK INTERACTIONS, PHOTON ENERGIES, DISSOCIATION, ISR
  • Çukurova Üniversitesi Adresli: Evet

Özet

We report measurements of the inclusive differential cross section for the single-diffractive reactions p(i) + (p) over bar --> p(f) + X and p + <(p)over bar (i)> --> X + <(p)over bar (f)> at root s = 630 GeV, in the momentum transfer range 0.8 < -t < 2.0 GeV2 and final-state Feynman-x(p) > 0.90. Based on the assumption of factorization, several new features of the pomeron flux factor are determined from simultaneous fits to our UA8 data and lower energy data from the CHLM collaboration at the CERN Intersecting Storage Rings. Prominent among these is that the effective pomeron Regge trajectory requires a term quadratic in t, with coefficient alpha " = 0.079 +/- 0.012 GeV-4. We also show that the data require a pomeron-proton cross section that first decreases with increasing diffractive mass (corresponding to the PPR term in the triple-Regge expansion) and then increases at larger mass (the PPP term), similar to real particle total cross sections. We measure the product K sigma(0) = 0.72+/-0.10 mb GeV-2 where K is the normalization constant of the pomeron flux factor in the proton and ao is the scale constant in the pomeron-proton total cross section. Finally, we report the occurrence of "beam jets" in the pomeron direction in the rest frame of the diffractive system. (C) 1998 Elsevier Science B.V.